moffet



3 SheetsSheet 1. J. MOPPET REVERSIBLE ENGINE.

(No Model.)

Patented Nov. 11, 1890.

(No M01181.) 3 SheetS-Sheet 2. J. M OPFBT. REVERSIBLE ENGINE.

No. 440,491. Patented Nov. 11; 1890M (No Model.) 3 Sheets-Sheet 3. J. MOFFET. REVERSIBLE ENGINE.

44 %j/67ZZ07 I Patented Nov. 11, 1.890..

ll iz UNITED STATES PATENT OFFIcE.

JOHN MOFFET, OF BAYONNE, NEV JERSEY.

REVERSIBLE ENGINE.

SPECIFICATION forming part of Letters Patent No. 440,491, dated November 11, 1890.

Application filed January 27, 1890. Serial No. 338,259. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN MOFFET, a citizen of the United States, residing at Bayonne, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Reversible Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to that class of rotary engines having a vertically-elongated shell or casing inclosing a slotted cylinder provided with sliding piston-blades, the ends of the rotary cylinder being recessed to enable it to pass around a cam, one of which is secured to each head of the casing for the purpose of successively projecting the pistonblades as the cylinder is rotated, an example of which form of engine is shown in my previous patent, No. 315,818, dated April 7, 1885, the object of the present improvements being to make such an engine reversible, and to simplify, perfect, and add to the efficiency of the same; and to this end my invention consists in the construction, arrangement, and combination of parts, substantially as will be hereinafter described and claimed.

In the accompanying drawings,illustrati 11g my invention, Figure 1 is an elevated view of the exhaust end of my improved reversible engine. Fig. 2 is a longitudinal section on the line :0 0c of Fig. 1. Fig. 3 is an elevation of the steam end of the piston, the parts being shown in the reversed position. Fig. 4 is an inner vertical end elevation at the exhaust end of the engine, the casing-head and other u sponding parts throughout all the different figures of the drawings.

A denotes the vertically-elliptical shell or casing, which is of suitable size and form.

Within casingA is the internal rotary cylinder B, the ends of which are recessed at B B to receive the vertically-elongated cams C C, one of which is secured to the inner side of each casinghead F and G.

D indicates the shaft or journal of the rotary oylinderB. This cylinder is formed with radial longitudinal slots, wherein are the sliding piston-blades E E. There are preferably eight of these blades, arranged as shown.

At one end of the shell or casing A is the head F, which serves as the steam-cover, and at the other end of the casing the head G, which serves as the exhaust-oover. The head F contains the steam-valve H, (shown in detail in Figs. 9, 10, and 11,) and consists of a metallic wheel or annular ring made hollow or formed with a circular recess h. A segment 70' of the peripheral edge of the valve H at the upper side thereof is toothed or provided with gear-indentations; also, the valve H has two pairs of siinilarly-disposed ports situated in opposite parts of the valve, as shown, a a being the upper ports of each pair and a a the lower. The head G contains the exhaust-valve I, (shownin details in Figs. 6, 7, and 8,) and consists, likewise, of a wheel or circular ring I, formed with a circular recess i. A segment 9." of the peripheral edge of the valve is provided with gear-teeth, and, further, the valve has four ports--two on each sidcthe upper one of each pair being lettered b and the lower one I). The exhaust-valve has also the openings 0 c at points adjacent to the main exhaust-ports, so that the latter maybe always open. The steam and exhaust valves are both held in place by means of the covers R R on the outside faces of the casingheads. lVhen the covers are in position, the valves, by reason of their circular recesses or channels, form steam-chests. The valves, although tightly and neatly located, are capable of rotation to change the position of their ports in reversing, and this rotation is accomplished by gears that engage the segmentgears of the valves, as I shall presently explain.

In the walls of the shell or casing A are steam passages K K, running horizontallytwo on each side of the shell--and they communicate with the interior of the shell through ports 71: 7a. In the casing-heads are also passages for the steam, running at right angles, as shown, and connecting the steam-passages K with the steam and the exhaust valves. (See Fig. 5.) L is the steam-inlet near the 5 steam-valve, (shown in dotted lines in Fig. 3,) and M is the outlet near the exhaust-valve and shown in dotted lines in Fig. 1.

The partial rotary motion is imparted to the valves to shift the same, when desired, by

means of the following devices: An upright lever-handle N is fixed upon a horizontal bar N, at each end of which is secured a downwardly-extending rod N These rods N N are secured to the outer ends of shaft 0 O,

which have their inner ends suitably journaled in hearings in the casing-heads. The

shafts O O carry gear wheels or pinions O O.

Said shafts or spindles have the stuffing boxes and glands O 0 whereby tight joints are formed. One of the pinions O engages the segment t" on the exhaust-valve and the other pinion O engages the segment h on the steamvalve. Thus it is evident that by grasping the handle N the engineer may cause both the valves to be rotated sufficiently to reverse the engine.

D D represent bushings located in the casing-heads-and around the main shaft D. These bushings are renewable in case of wear,

3'0 and hence can easily be replaced at any time.

P P in Fig. 4 denote packing-pieces, which are adjusted by means of screws 19 p.

The operation of my improved reversible steam-engine may be briefly stated as follows:

When the lever-handle is vertical, as indicated at Fig. 1, the engine will be at rest with valves closed. Suppose, now, the handle to be moved in one direction into an inclined position, as shown in Fig. 3, in consequence of 0- which the valves will be shifted so that the steam-valve will have two diagonally-opposite 'portsthat is, one port a and one port a in coincidence with two steam-passages, said port a being opposite one of the upper steam-passages and said port a, being opposite one of the lower passages. (See Fig. 3.) Likewise it is obvious that the exhaust-valve will occupy a position where two of its ports will come into coincidence with two of the steam-passages. Steam entering the engine through the inlet L will now pass through the steam-valve and out through ports a a, and on through the passages K K and ports 7.; into the interior of the cylinder, where it will act on the blades,

causing the shaft D to revolve in the usual' manner. The steam will then exhaust through the ports at the other end of the engine. J denotes the main exhaust-ports. If, now, it is desired to reverse the operation of the engine, the engineer can lay hold of the lever-handle and shift the same into an inclined position on the other side of the perpendicular. This will shift the valves and cause the steamvalve to bring its port into coincidence with the other steam-passages, so that steam will be admitted so as to act upon the other side of the blades. Of course it may be also stated that the exhaustvalve will have its ports properly changed to permit the exhaustion of the steam consequent upon its changed course through the engine. In this way the revolution of the rotary cylinder will be reversed, the steam acting upon the other sides of the blades. Thus it will be seen that at any time the engineer may, by laying hold of and reversing the lever-handle, cause the engine to be reversed and to run in an opposite direction.

Having thus described my invention. what I claim as new, and desire to secure by Letters Patent, is-- 1. In a steam-engine, the combination of the shell or casing, the rotary cylinder within the same, the sliding blades with which said cylinder is provided, the annular exhaust and steam valves provided with suitable ports, and the devices for simultaneously rotating the same so as to reverse the engine.

2. In a steam-engine, the combination of the shell or casing, the rotary cylinder and its shaft, the series of sliding blades with which said cylinder is provided, the casing-heads at each end of the casing, the cam connected thereto upon which the sliding blades operate, the ports and passages in said casing and heads, the steam-inlet valve and the exhaustvalve, each consisting of an annular ringprovided with suitable ports, and devices for imparting to these valves a simultaneous rotary motion.

3. In a steam-engine, the combination, with the shell or casing, the rotary cylinder, and the sliding blades, of the steam-inlet valve con sisting of an annular ring having a recess and ports, and the steam-exhaust valve consisting, likewise, of an annular ring having a recess and ports, said-steam and exhaust valves being arranged so as to be capable of a partial rotation.

4. In a steam-engine, the combination of the steam-valve having an annular recess and suitable ports, the exhaust-valve, likewise having an annular recess and suitable ports, and the devices consisting of gears that engage these valves, and operating-levers for said gears, whereby the said valves may be simultaneously rotated so as to reverse the engine.

5. The combination, with the shell or casing, the rotary cylinder and its shaft within the same provided with moving blades, the easing-heads, and the cams, of the steam-valve having an annular recess, the exhaust-valve likewise having an annular recess, said valves being arranged in the heads so as to be capable of rotation, the devices for impartin g a simultaneous movement to these valves, the valve-covers, steam-inlet, and suitable ports and passages arranged as specified.

6. The combination, with the shell or casing and its rotary internal parts, together'with suitable ports and passages, of the steamvalve consisting of an annular ring having a circular recess, suitable ports, and a segmentgear, and. the exhaust-valve consisting, like- IIO wise, of an annular ring with an annular recess, suitable ports, the cut-away part, and the segment-gear, and the devices for simultaneously moving these valves, consisting of a lever-handle and pinions engaging the segments of the valves.

7. In a steam-engine, the combination, with the shell or casing and the rotary blade-provided cylinder within the same, of the steamvalve H, having recess h and ports a a a a and segment-gear h, the exhaust-valve I, having recess 6, portsb b b b, openings 0 c, and segment-gear i, the pinions O, engaging the segments, and the lever-handle carried by the horizontal bar connected to the shafts on which are mounted the said pinions O 0, all as herein stated.

8. In combination with the shell or casing of a steam-engine, the rotary valve adjacent to the steam-inlet, having a segment-gear, and a rotary exhaust-valve adjacent to the steam exhaust, having, likewise, a segment-gear, the

pinions O O, engaging said segments and located on the shafts O 0, and the lever'handle N, aflixed to the bar M, which connects with the shafts O O by the bars N N 9. The combination, with the shell or casing, the rotary slotted cylinder within and its shaft, of the sliding blades with which said cylinder is provided, the casing-heads, the ro tary steam-valve in one head and the rotary exhaust-valve in the other, each consisting of an annular ring provided with suitable ports, the cover-plates for said valves, the steaminlet and the steam-outlet, and the devices for imparting simultaneous movement to the two valves, as specified.

In testimony whereof I affix my signature in presence of two Witnesses.

JOHN MOFFET. Witnesses:

F. A. LOWE, L. B. HOWE. 

